LRDOCS-650 Explained that's it's necessary to enable the tunneling servlet auth verifier and to set up a shared authentication key in order to set up remote staging
LRDOCS-650 Explained that using a pre-shared key for remote staging web service authentication eliminates the need to send the publishing user's password to the remote server; if the pre-shared keys match, Liferay creates an authentication context (permission checker) based on the user's email address, screen name, or user ID
Merge pull request #704 from jrao/LRDOCS-650

https://issues.liferay.com/browse/LRDOCS-650